Some concept cars are the stuff of dreams, and some make a justified beeline for the crusher. But then there are the truly glorious ones: the concepts built just for show, never meant to be anything more than the Paris runway model of the automotive world, or those lucky few that see their design elements actually influence production cars, even if they themselves never make it to the street. Tragically, for many of the best, somewhere between an auto show debut and the fevered, hopeful dreams of auto enthusiasts, some kind of childhood-hating shutdown switch gets flicked by faceless bean counters. In honor of the fallen, we take a look at 10 of the best concept cars that only ever got to lay rubber on the auto show floor or cradle the butts of a fortunate few.